VulnerabilityModified
CVE-2020-36242
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
CRITICAL 9.1EPSS 6.72%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.72%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 6.72% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-787
- Affected
- cryptography.io/cryptography · fedoraproject/fedora · oracle/communications cloud native core network function cloud native environment
- Source
- cve@mitre.org
References
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rstRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/5615Exploit, Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rstRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/5615Exploit, Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.